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IgG4-related tubulointerstitial nephritis with Henoch-Schönlein purpura nephritis. (a) Periodic acid-Schiff (PAS) staining reveals severe tubulointerstitial nephritis (PAS ×100). (b) Global endocapillary proliferation is evident (PAS ×400). (c) Immunofluorescence staining for C3 reveals mesangial and capillary wall deposits (×400). (d) Many IgG4+ plasma cells are seen in the interstitium (IgG4 ×400).
